:root {
  color-scheme: light dark;
  --paper: #f7f6f2;
  --surface: #ffffff;
  --tint: #eeeae4;
  --ink: #242422;
  --muted: #676760;
  --line: #deddd5;
  --accent: #800000;
  --accent-text: #800000;
  --accent-tint: #f1e8e5;
  --green: #38624a;
  --green-tint: #eaf0e8;
  --shadow: 0 16px 50px -25px #30221b40, 0 2px 6px #30221b05;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #181817;
    --surface: #222220;
    --tint: #2b2927;
    --ink: #efeee9;
    --muted: #b5b2a9;
    --line: #3c3935;
    --accent-text: #e5a5a5;
    --accent-tint: #382829;
    --green: #b5d4b8;
    --green-tint: #2d382e;
    --shadow: 0 18px 45px -20px #00000070;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 30px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font); font-size: 15px; line-height: 1.7; -webkit-font-smoothing: antialiased; }
html[lang="zh-CN"] { letter-spacing: .04em; }
button, input, textarea { font: inherit; letter-spacing: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
button { color: inherit; }
button:not(:disabled), summary { cursor: pointer; }
button:disabled { cursor: default; }
button { border: 0; }
svg, img { display: block; flex-shrink: 0; }
img { max-width: 100%; object-fit: contain; }
p, h1, h2, h3, ol { margin: 0; }
h1, h2, h3 { font-weight: 580; line-height: 1.3; }
h2 { font-size: 31px; }
h3 { font-size: 18px; }
p { text-wrap: pretty; }
strong { font-weight: 600; }
em { font-style: normal; color: var(--accent-text); }
code { font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: .92em; }
code, [lang="en-US"] { letter-spacing: normal; }
a, button, summary { touch-action: manipulation; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--accent-text); outline-offset: 5px; border-radius: 4px; }
[hidden] { display: none !important; }
.wrap { width: min(1120px, calc(100% - 96px)); margin-inline: auto; }
.icon-library, .sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.icon { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.skip-link { position: fixed; z-index: 20; top: 10px; left: 10px; padding: 8px 14px; background: var(--surface); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
.site-header { height: 104px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; line-height: 1.35; }
.brand > span { display: grid; gap: 1px; }
.brand strong { font-size: 15px; font-weight: 650; }
.brand span span { color: var(--muted); font-size: 13px; }
.navigation { display: flex; align-items: center; gap: 30px; font-size: 14px; }
.navigation > a:not(.nav-cta) { transition: color 150ms; }
.navigation > a:not(.nav-cta):hover { color: var(--accent-text); }
.navigation .language-link { font-size: 14px; }
.nav-cta { display: flex; align-items: center; gap: 10px; border: 1px solid var(--line); padding: 8px 16px; border-radius: 7px; transition: border-color 150ms, background 150ms; }
.nav-cta:hover { border-color: var(--ink); background: var(--surface); }
.nav-cta .icon { width: 17px; }
.hero { padding-block: 74px 86px; display: grid; grid-template-columns: 1.07fr 1fr; align-items: center; gap: 76px; }
.eyebrow { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--muted); line-height: 1.5; }
.eyebrow-line { width: 24px; height: 1px; background: var(--accent-text); }
h1 { font-size: clamp(34px, 3.3vw, 46px); line-height: 1.25; font-weight: 600; margin-block: 24px 22px; text-wrap: balance; }
h1 em { display: inline-block; margin-top: 3px; }
.hero-description { color: var(--muted); max-width: 445px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 22px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 18px; min-height: 46px; padding: 11px 18px; border-radius: 7px; font-size: 15px; font-weight: 550; line-height: 1.4; text-align: center; transition: transform 150ms, box-shadow 150ms, background 150ms; }
.primary { background: #800000; color: #ffffff; border: 1px solid #800000; }
.primary:hover { box-shadow: 0 4px 12px #80000025; transform: translateY(-1px); }
.primary:active { transform: translateY(0); }
.quiet { border: 1px solid var(--line); background: transparent; }
.quiet:hover { background: var(--paper); }
.text-link { display: inline-flex; align-items: center; gap: 8px; background: transparent; padding: 0; font-size: 14px; line-height: 1.5; }
.text-link .icon { width: 16px; height: 16px; transition: transform 150ms; }
.text-link:hover .icon { transform: translate(2px, -1px); }
.hero-note { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; color: var(--muted); margin-top: 22px; font-size: 13px; }
.hero-note .icon { width: 16px; height: 16px; }
.hero-note > span { margin-inline: 2px; }
.preview { position: relative; }
.preview-label { display: flex; gap: 7px; align-items: center; color: var(--muted); font-size: 12px; margin: 0 3px 16px; }
.live-dot { height: 5px; width: 5px; border-radius: 50%; background: var(--accent-text); }
.preview-index { margin-left: auto; font-family: ui-monospace, monospace; font-size: 11px; }
.browser { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); overflow: hidden; }
.browser-bar { display: flex; align-items: center; height: 43px; border-bottom: 1px solid var(--line); gap: 17px; padding: 0 15px; background: var(--paper); }
.window-dots { display: flex; gap: 5px; }
.window-dots i { display: block; width: 6px; height: 6px; border: 1px solid var(--line); border-radius: 50%; background: var(--surface); }
.browser-address { display: flex; align-items: center; justify-content: center; gap: 7px; flex: 1; font-family: ui-monospace, monospace; font-size: 11px; color: var(--muted); }
.browser-address .icon { width: 10px; height: 10px; }
.browser-mark { width: 15px; height: 15px; color: var(--muted); }
.demo { padding: 27px 30px 24px; min-height: 332px; }
.demo-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 25px; line-height: 1.3; }
.demo-brand span { display: grid; gap: 3px; }
.demo-brand strong { font-size: 15px; }
.demo-brand small { font-size: 11px; color: var(--muted); }
.demo-brand-lock { margin-left: auto; width: 15px; height: 15px; color: var(--muted); }
.demo h2 { font-size: 23px; line-height: 1.35; font-weight: 550; }
.demo-initial > p { color: var(--muted); font-size: 13px; margin-top: 10px; }
.demo-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 26px; }
.demo-buttons .button { min-height: 42px; font-size: 14px; padding: 9px 16px; }
.demo-initial .demo-permission { display: flex; align-items: center; gap: 7px; margin-top: 19px; font-size: 11px; }
.demo-permission .icon { width: 14px; height: 14px; }
.preview-caption { display: flex; align-items: start; justify-content: space-between; gap: 12px; margin: 16px 3px 0; color: var(--muted); font-size: 12px; line-height: 1.5; min-height: 33px; }
.preview-tag { background: var(--tint); padding: 2px 7px; border-radius: 4px; font-size: 10px; white-space: nowrap; }
.demo-progress h2 { font-size: 21px; margin-top: -2px; }
.progress-list { list-style: none; padding: 0; margin-top: 14px; display: grid; gap: 12px; }
.progress-list li { display: flex; align-items: center; gap: 10px; opacity: .42; transition: opacity 250ms; }
.progress-list li.is-complete, .progress-list li.is-current { opacity: 1; }
.step-mark { width: 24px; height: 24px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--green); flex-shrink: 0; }
.step-mark .icon { width: 14px; height: 14px; opacity: 0; }
.is-complete .step-mark { background: var(--green-tint); border-color: var(--green-tint); }
.is-complete .step-mark .icon { opacity: 1; }
.is-current .step-mark { border-color: var(--accent-text); }
.progress-list li > span:nth-child(2) { display: grid; gap: 1px; }
.progress-list strong { font-size: 13px; line-height: 1.3; }
.progress-list small { color: var(--muted); font-size: 11px; line-height: 1.4; }
.step-site { margin-left: auto; color: var(--muted); font-size: 11px; }
.replay { margin-top: 15px; font-size: 12px; color: var(--accent-text); }
.replay:disabled { visibility: hidden; }
.service-strip { display: flex; align-items: center; justify-content: space-between; gap: 20px; border-block: 1px solid var(--line); padding-block: 21px; font-size: 13px; }
.service-strip > span { color: var(--muted); }
.service-strip > div { display: flex; align-items: center; gap: 27px; }
.service-strip strong { font-size: 15px; font-weight: 550; }
.service-strip div > span:last-child { display: flex; align-items: center; gap: 5px; font-size: 12px; color: var(--muted); }
.service-strip .icon { width: 14px; height: 14px; }
.service-divider { height: 14px; width: 1px; background: var(--line); }
.section { padding-block: 90px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 25px; margin-bottom: 44px; }
.section-heading h2 { margin-top: 12px; }
.section-heading > p { color: var(--muted); font-size: 15px; }
.how-grid { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.how-grid li { border-top: 1px solid var(--line); padding-top: 22px; }
.section-number { color: var(--accent-text); font: 13px ui-monospace, monospace; }
.how-grid h3 { margin-block: 19px 12px; }
.how-grid p { color: var(--muted); }
.small-label { display: block; margin-top: 26px; font-size: 12px; color: var(--accent-text); }
.privacy-section { background: #292322; color: #f4f0e9; }
.privacy-inner { display: grid; grid-template-columns: .9fr 1.1fr; gap: 100px; padding-block: 67px; }
.privacy-intro { align-self: start; }
.privacy-emblem { display: grid; place-items: center; width: 39px; height: 43px; border: 1px solid #74625e; border-radius: 10px 10px 17px 17px; color: #e7bcb6; margin-bottom: 28px; }
.privacy-emblem .icon { width: 19px; }
.privacy-intro .eyebrow { color: #c7b5af; }
.privacy-intro h2 { font-size: 34px; margin-block: 15px 19px; line-height: 1.4; }
.privacy-intro em { color: #e7bcb6; }
.privacy-intro > p:last-child { color: #c7c1b9; font-size: 15px; }
.privacy-points { display: grid; }
.privacy-points article { display: flex; gap: 18px; padding-block: 25px; border-bottom: 1px solid #504541; }
.privacy-points article:first-child { padding-top: 0; }
.privacy-points article:last-child { border: 0; padding-bottom: 0; }
.privacy-points article > .icon { margin-top: 3px; color: #e7bcb6; width: 20px; height: 20px; }
.privacy-points h3 { font-size: 17px; font-weight: 550; }
.privacy-points p { color: #c7c1b9; font-size: 15px; margin-top: 9px; }
.privacy-points .text-link { color: #ead5cb; margin-top: 16px; font-size: 13px; }
.security-details { margin-top: 15px; }
.security-details summary { display: inline-flex; align-items: center; gap: 7px; color: #ead5cb; list-style: none; font-size: 13px; }
.security-details summary::-webkit-details-marker { display: none; }
.security-details summary .icon { width: 15px; height: 15px; transition: transform 150ms; }
.security-details[open] summary .icon { transform: rotate(90deg); }
.security-details p { font-size: 15px; }
.privacy-section :focus-visible { outline-color: #e7bcb6; }
.setup-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 90px; }
.download-panel { padding: 32px; align-self: start; background: var(--tint); border-radius: 10px; display: flex; flex-direction: column; align-items: start; }
.download-panel h3 { font-size: 23px; line-height: 1.35; margin-top: 20px; }
.download-panel h3 span { font-weight: 450; color: var(--muted); }
.download-panel p { margin-top: 16px; color: var(--muted); }
.download-panel .button { margin-top: 25px; width: 100%; }
.download-note { margin: 11px auto 21px; font-size: 12px; color: var(--muted); }
.download-panel .text-link { margin-inline: auto; font-size: 13px; }
.setup-steps { padding: 0; list-style: none; }
.setup-steps li { display: flex; gap: 20px; padding-block: 24px; border-bottom: 1px solid var(--line); }
.setup-steps li:first-child { padding-top: 0; }
.setup-steps li:last-child { border: 0; padding-bottom: 0; }
.setup-number { height: 27px; width: 27px; border: 1px solid var(--line); display: grid; place-items: center; border-radius: 50%; color: var(--muted); font: 12px ui-monospace, monospace; flex-shrink: 0; margin-top: 1px; }
.setup-steps h3 { font-size: 18px; margin-bottom: 10px; }
.setup-steps p { color: var(--muted); }
.setup-steps p strong { color: var(--ink); font-weight: 500; }
.setup-steps .text-link { margin-top: 15px; color: var(--accent-text); }
.copy-field { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 6px; margin-top: 17px; }
.copy-field > code { font-size: 12px; }
.copy-field button { display: inline-flex; align-items: center; gap: 5px; padding: 4px; background: transparent; color: var(--accent-text); font-size: 11px; }
.copy-field button .icon { width: 13px; height: 13px; }
.copy-status:not(.sr-only) { font-size: 12px; color: var(--muted); display: block; margin-top: 6px; }
.faq-section { padding-block: 0 85px; display: grid; grid-template-columns: .8fr 1.2fr; gap: 90px; }
.faq-intro h2 { margin-top: 12px; }
.faq-items details { border-bottom: 1px solid var(--line); }
.faq-items details:first-child { border-top: 1px solid var(--line); }
.faq-items summary { list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 15px; padding-block: 21px; line-height: 1.5; font-size: 15px; font-weight: 500; }
.faq-items summary::-webkit-details-marker { display: none; }
.faq-toggle { width: 12px; height: 12px; position: relative; flex-shrink: 0; color: var(--muted); }
.faq-toggle::before, .faq-toggle::after { content: ""; position: absolute; top: 50%; left: 0; height: 1px; width: 12px; background: currentColor; }
.faq-toggle::after { transform: rotate(90deg); transition: transform 150ms; }
details[open] .faq-toggle::after { transform: rotate(0); }
.faq-items details p { color: var(--muted); padding: 0 26px 21px 0; }
.closing { padding-block: 34px; display: flex; align-items: center; justify-content: space-between; gap: 30px; border-block: 1px solid var(--line); }
.closing h2 { font-size: 25px; margin-top: 7px; }
.closing .button { flex-shrink: 0; }
.site-footer { padding-block: 38px 28px; }
.footer-top { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.site-footer .brand { gap: 10px; }
.site-footer .brand strong { font-size: 12px; }
.site-footer .brand span span { font-size: 11px; }
.footer-links { display: flex; gap: 24px; font-size: 12px; color: var(--muted); }
.footer-links a:hover, .copyright a:hover { color: var(--accent-text); }
.independence { color: var(--muted); font-size: 12px; max-width: 780px; margin-top: 28px; }
.copyright { color: var(--muted); font-size: 11px; margin-top: 8px; }
.help-text { color: var(--muted); font-size: 13px; margin-top: 15px; }
html[lang="zh-CN"] h1 { font-size: clamp(32px, 3vw, 42px); line-height: 1.45; }
html[lang="zh-CN"] .hero-description { line-height: 1.9; }
html[lang="zh-CN"] .demo h2 { font-size: 21px; line-height: 1.6; }
html[lang="zh-CN"] .demo-permission { font-size: 11px; }
html[lang="zh-CN"] .privacy-intro h2 { line-height: 1.55; }
@media (min-width: 1500px) { .hero { padding-block: 90px 100px; } }
@media (max-width: 1080px) {
  .wrap { width: calc(100% - 64px); }
  .hero { gap: 36px; }
  h1 { font-size: 37px; }
  .hero-actions { gap: 17px; }
  .hero-actions .text-link { font-size: 13px; }
  .preview-label { font-size: 11px; }
  .demo { padding-inline: 24px; }
  .demo h2 { font-size: 21px; }
  .service-strip { flex-direction: column; align-items: start; gap: 9px; }
  .section-heading > p { max-width: 250px; }
  .privacy-inner { gap: 60px; }
  .setup-grid, .faq-section { gap: 50px; }
  .download-panel { padding: 26px; }
}
@media (max-width: 800px) {
  .site-header { height: 90px; }
  .navigation { gap: 20px; }
  .navigation > a[href="#privacy"] { display: none; }
  .hero { grid-template-columns: 1fr; padding-block: 45px 49px; gap: 48px; }
  h1 { font-size: 42px; }
  .hero-copy { max-width: 520px; }
  .hero-description { max-width: 490px; }
  .preview { width: min(100%, 510px); margin-inline: auto; }
  .preview-label { font-size: 12px; }
  .demo { padding: 27px 30px 24px; }
  .demo h2 { font-size: 23px; }
  .demo-progress h2 { font-size: 21px; }
  .service-strip { align-items: center; padding-block: 20px; }
  .section { padding-block: 64px; }
  .section-heading { align-items: start; flex-direction: column; gap: 17px; margin-bottom: 32px; }
  .section-heading > p { max-width: 100%; }
  .section-heading > p br { display: none; }
  h2 { font-size: 28px; }
  .how-grid { gap: 25px; }
  .how-grid h3 { font-size: 17px; }
  .privacy-inner { grid-template-columns: .85fr 1.15fr; gap: 36px; padding-block: 49px; }
  .privacy-intro h2 { font-size: 28px; }
  .privacy-points article { gap: 12px; }
  .setup-grid { grid-template-columns: .9fr 1.1fr; gap: 35px; }
  .download-panel { padding: 24px; }
  .download-panel .button { gap: 7px; padding-inline: 12px; font-size: 13px; }
  .download-panel h3 { font-size: 20px; }
  .setup-steps li { gap: 13px; }
  .copy-field { flex-wrap: wrap; }
  .faq-section { gap: 30px; padding-bottom: 60px; }
  .closing h2 { font-size: 23px; }
}
@media (max-width: 580px) {
  .wrap { width: calc(100% - 40px); }
  .site-header { height: 82px; gap: 12px; }
  .brand { gap: 9px; }
  .site-header .brand img { width: 34px; height: 34px; }
  .brand strong { font-size: 13px; }
  .brand span span { font-size: 11px; }
  .navigation { gap: 17px; }
  .navigation > a[href="#how-it-works"], .navigation .nav-cta { display: none; }
  .navigation .language-link { border: 1px solid var(--line); border-radius: 5px; padding: 5px 10px; font-size: 12px; }
  .hero { padding-block: 27px 34px; gap: 36px; }
  .eyebrow { font-size: 12px; }
  h1 { font-size: 34px; margin-block: 20px 18px; }
  html[lang="zh-CN"] h1 { font-size: 32px; }
  .hero-description { max-width: 410px; }
  .hero-actions { gap: 20px; margin-top: 24px; }
  .hero-actions .button { font-size: 14px; gap: 14px; padding-inline: 15px; }
  .hero-actions .text-link { font-size: 13px; }
  .hero-note { font-size: 12px; gap: 7px; margin-top: 19px; }
  .preview-label { font-size: 11px; }
  .preview-index { font-size: 10px; }
  .demo { padding: 23px 24px; min-height: 326px; }
  .demo h2 { font-size: 22px; }
  .demo-progress h2 { font-size: 20px; }
  .demo-brand { margin-bottom: 23px; }
  .demo-initial .demo-permission { font-size: 10px; }
  .preview-caption { font-size: 11px; }
  .service-strip { align-items: start; gap: 10px; font-size: 12px; }
  .service-strip > div { flex-wrap: wrap; gap: 12px 17px; }
  .service-strip div > span:last-child { width: 100%; font-size: 12px; }
  .service-strip .service-divider:nth-last-child(2) { display: none; }
  .section { padding-block: 48px; }
  h2 { font-size: 25px; }
  .section-heading h2 { margin-top: 10px; }
  .how-grid { grid-template-columns: 1fr; gap: 25px; }
  .how-grid li { padding-top: 19px; }
  .how-grid h3 { margin-block: 12px 10px; font-size: 18px; }
  .small-label { margin-top: 15px; }
  .privacy-inner { grid-template-columns: 1fr; padding-block: 39px; gap: 29px; }
  .privacy-emblem { margin-bottom: 19px; }
  .privacy-intro h2 { font-size: 29px; }
  .privacy-intro > p:last-child br { display: none; }
  .privacy-points article { padding-block: 22px; gap: 15px; }
  .privacy-points article:first-child { padding-top: 24px; border-top: 1px solid #504541; }
  .setup-grid { grid-template-columns: 1fr; gap: 34px; }
  .download-panel { padding: 26px; }
  .download-panel h3 { font-size: 23px; }
  .download-panel .button { font-size: 15px; gap: 18px; }
  .setup-steps li { gap: 16px; }
  .copy-field { flex-wrap: nowrap; }
  .faq-section { grid-template-columns: 1fr; gap: 24px; padding-bottom: 42px; }
  .closing { flex-direction: column; align-items: start; gap: 22px; padding-block: 29px; }
  .closing h2 { font-size: 24px; }
  .site-footer { padding-block: 29px 23px; }
  .footer-top { flex-direction: column; align-items: start; gap: 23px; }
  .footer-links { gap: 25px; }
  .independence { margin-top: 24px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}
@media print {
  body { background: #fff; color: #222; }
  .navigation, .demo-buttons, .replay, .copy-field button { display: none; }
  .wrap { width: 100%; }
  .privacy-section { color: #222; background: #eee; }
  .privacy-points p, .privacy-points .text-link, .privacy-intro .eyebrow, .privacy-intro > p:last-child { color: #333; }
}